fall rush?

I just finished my freshman year and this past spring I thought I would give greek life a try. I actively rushed DTD, Theta Chi, and SigEp (I went to all 4 events for all fraternities), but was not extended a bid or callback to any of the three despite my direct legacy to SigEp. I was disappointed at first, but I started to think that maybe I rushed the wrong ones. I honestly did not utilize the "meet the greek" night at Perkins before rush and just chose to rush the fraternities based off of word of mouth. I am excited to rush again this fall because I would love to join greek life, but should I rush any of the same that I did in the spring? Do they typically extend more bids in the fall? Or should I choose all new fraternities to rush and what is an adequate amount to rush? Thanks!